Stool



FIG. 1 is a perspective view of a stool showing the new design;

FIG. 2 is a front elevational view of FIG. 1;

FIG. 3 is a left side elevational view of FIG. 1, the right side elevation is a mirror image of the left side elevation;

FIG. 4 is a back elevational view of FIG. 1;

FIG. 5 is a top plan view of FIG. 1; and,

FIG. 6 is a bottom view of FIG. 1.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a stool, as shown and described. 